Export symbols needed by the Chromium component build (part 8).

This CL uses RTC_EXPORT (defined in rtc_base/system/rtc_export.h)
to mark WebRTC symbols as visible from a shared library, this doesn't
mean these symbols are part of the public API (please continue to refer
to [1] for info about what is considered public WebRTC API).

[1] - https://webrtc.googlesource.com/src/+/HEAD/native-api.md

Bug: webrtc:9419
Change-Id: Ib2c29054b2ae008f5291bd3b762a504b18534326
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130513
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27410}
diff --git a/pc/ice_server_parsing.h b/pc/ice_server_parsing.h
index c73d803..8cdd31a 100644
--- a/pc/ice_server_parsing.h
+++ b/pc/ice_server_parsing.h
@@ -17,6 +17,7 @@
 #include "api/rtc_error.h"
 #include "p2p/base/port.h"
 #include "p2p/base/port_allocator.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
@@ -26,10 +27,10 @@
 //
 // Intended to be used to convert/validate the servers passed into a
 // PeerConnection through RTCConfiguration.
-RTCErrorType ParseIceServers(
-    const PeerConnectionInterface::IceServers& servers,
-    cricket::ServerAddresses* stun_servers,
-    std::vector<cricket::RelayServerConfig>* turn_servers);
+RTC_EXPORT RTCErrorType
+ParseIceServers(const PeerConnectionInterface::IceServers& servers,
+                cricket::ServerAddresses* stun_servers,
+                std::vector<cricket::RelayServerConfig>* turn_servers);
 
 }  // namespace webrtc